Neutral relay.



No. 781,736. PATENTED EEB. v, 1905. 0. D. OLSEN & J. M. KINNEAR.

NEUTRAL RELAY.

APPLICATION FILED AUG. 1, 1904.

UNITED STATES Patented February 7, 1905..

PATENT OFFICE.

CHARLES D. OLSEN AND JOHN M. KINNEAR, OF DENVER, COLORADO.

NEUTRAL RELAYu SPECIFICATION forming part of Letters Patent No. 781,736,dated February 7, 1905.

Application filed August 1, 1904:. Serial No. 218,968.

To all whom it may concern:

Be it known that We, OHARLEs D. OLSEN and JOHN M. KINNEAR, citizens ofthe United States, residing in the city and county of Denver and Stateof Colorado, have invented certain new and useful Improvements inNeutral Relays; and we do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the characters ofreference marked thereon, which form a part of this specification.

Our invention relates to improvements in neutral relays for use inquadruplex telegraph systems; and our object is to prevent the making offalse signals due to the momentary demagnetization of the differentialmagnet while making current reversals at the pole-changer of a distantor terminal station. This object we accomplish by the use of anauxiliary magnet whose coil is within the same local circuit as themagnet of the relay-sounder, the said circuit being closed, whereby thecurrent is compelled to pass through the coils of the auxiliary andsounder magnets when the main lever of, the differential magnet is inengagement with the front stop, the said lever having been primarilydrawn to this position by the action of the differential magnet. We alsoprovide an auxiliary lever located opposite the main lever and providedwith an armature acted on by the differential magnet when energized.This auxiliary lever when engaging its back stop closes a shunt-circuit,whereby the auxiliary magnet is cut out of the circuit, and consequentlydeenergized. Now as soon as the current is reversed and the differentialmagnet deenergized the auxiliary magnet will act to retain the mainlever in its normal position, thus causing the current to pass throughthe sounder-magnet, whereby the sounder-lever is held against its frontstop to prevent the making of false signals, and this condition willexist unless the auxiliary lever acted on by its retractile springreaches its back stop and closes the shunt-circuit, in which event theauxiliary and sounder magnets would be deenergized; but as the changingof polarity whereby the differential magnet is deenergizcd requires buta moment of time the differential magnet is again energized before theauxiliary lever has time to reach its back stop and shunt the currentout of or around the auxiliary magnet, the said auxiliary lever beingagain attracted by the differential magnet, whereby it is prevented fromclosing the shunt-circuit during the whole time of making currentreversals. This time constant or the time of no current in thedifferential magnet at reversals varies and is regulated by the distancethe auxiliary lever has to travel between its front and back stops andalso by its retractile spring to correspond with the length and capacityof the line.

Having briefly outlined our improved construction, as well as thefunction it is intended to perform, we will proceed to describe the samein detail, reference being made to the accompanying drawings, in whichis illustrated an embodiment thereof.

In the drawings, Figure 1 is a diagrammatic view of a neutral relayequipped with our improvements, the parts being shown in the positionwhen the differential magnet is energized. Fig. 2 is a similar viewshowing the position of the levers when the differential magnet isdeenergized and the auxiliary magnet energized.

The same reference characters indicate the same parts in both views.

Let A designate the main battery or source of current, A and Aconductors leading to the differential magnet A and A' -and A conductorsleading to the main and auxiliary lines, respectively, of the system.

A is the main lever of the differential magnet and is provided witharmatures A and A placed adjacent the magnets A and B, respectively. Aretractile spring A is connected with the main lever and when thedifferential magnet is deenergized has a tendency to draw the lever awayfrom the last-named magnet or away from the front stop M to the backstop F. A sounder N is located in the circuit of a local battery D andconsists of a magnet 6, a lever N, front and back stops N and N, and aretractile spring N".

B is an auxiliary magnet, andOis an auxiliary lever oppositely locatedfrom the lever l This lever C is provided with an arma A. turc C,adapted to be acted on by the differential magnet. Connected with thelever C is a spring U, whose tendency is to draw the lever from thefront stop. M to the back stop M and this will be accomplished when thedifferential magnet remains deenergized during a sufficient time. Ashunt-conductor L leads from the front stop M of the lever A to the backstop M of the lever O. A conductor 5 leads from one pole of the localbattery l) to the magnet 6 of the sounder I, while a conductor 7 leads.from the magnet 6 to the lever C. A conductor Sleads from the oppositepole of the local battery to the main lever A. A wire A" leads from theconductor L and after passing spirally around the core of the magnet Bisconnected with the conductor 7, as shown at 9.

1n the working of our improvement it may be assumed that thedifferential magnet is energized and that the two levers A and C areinengagement with their front stops M and M, respectively, the levershaving been placed in this position through the action of thedifferential magnet. As soon as thelever A reaches its front stop thecurrent passes through the coils of the sounder magnet 6, whereby thesounder-lever f is drawn to its front stop and held in this position aslong as the lever A is in the position stated or in engagement with itsfront stop, thus preventing the making of false signals during currentreversals at a distant or remote station. N hen the levers A and C arein engagement with their front stops, as aforesaid, or when the mainlever is in this position and theauxiliarylever is away from its backstop, the auxiliary magnet is energized and acts on the main lever witha retaining force. N ow if during a reversal of the current through theinstrumentality of the pole-changer at a distant station thedifferential magnet A should be momentarily de'energized the tendencywould be for the lever A to fall away from the front stop M, resultingin the making of a. false signal by the deenergizing of thesounder-magnet 6, whereby the sounder-lever N would be drawn against itsback stop by the retractile spring N"; but the auxiliary magnet preventsthis result and acts on the main lever to hold itin position against itsfront stop at all times while 'it will be observed that the lever A isin engagement with the front stop, not having changed its position fromthat shown in Fig. 1 or when the differential magnet is energized. Thelever 0, however, has commenced to fall away from the front stop towardthe back stop, since there is no retaining force to hold it in itsposition against the front stop. However, in the ease of the main leverA the auxiliary magnet acts with a retaining force, as heretoforestated, on the armature A to maintain the main lever in its positionagainst the front stop, and this position it will occupy during themaking of current reversals, since the differential magnet will be againonergized before the auxiliary lever can reach its back stop and cut theauxiliary magnet out of the circuit.

Having thus described our invention, what we claim is-- 1. Thecombination with the differential magnet, main lever and sounder of aneutral relay, of an auxiliary magnet arranged in suitable proximity tothe main lever of the relay, a circuit in which the auxiliary magnet andsounder-magnet are located, the said circuit being closed by themovement of the main lever to its front stop when the differentialmagnet is energized, the main lever being then retained against itsfront stop by the auxiliary magnet whereby the sounder-lever is prevented from making a false signal during ourrent-reversals, an auxiliarylever located to be acted on by the differential magnet when energized,and a short circuit around the auxiliary magnet, said circuit beingclosed by the auxiliary lever when engaging the back stop.

2. The combination with the differential magnet, the main lever andsounder of a neutral relay, of an auxiliary magnet located in suitableproximity to the main lever of the relay, a local circuit in which theauxiliary magnet and sounder-magnet are located, the said circuit beingclosed when the main lever is in engagement with its front stop to whichposition it is attracted by the differential magnet when energized, andin which position it is retained by the auxiliary magnet after thedifferential magnet has been deenergizcd, an auxiliary lever located tobe acted on by the differential magnet when energized, and ashunt-conductor forming a short path for the current of the localcircuit around the auxiliary magnet when the auxiliary lever is inengagement with its back stop.

3. The combination with the differential "magnet, main lever and sounderof a neutral relay, of an auxiliary magnet located in suitable proximityto the main lever, the latter being provided with an armature adapted tobe attracted by the auxiliary magnet when energized, a circuit in whichthe coils of the auxiliary and sounder magnets are located, an auxiliarylever having an armature located to be acted on by the differentialmagnet when energized, the circuit being closed through the coils of theauxiliary andsounder magnets when the main lever engages its front stop,and the auxiliary lever is away from its back stop, and ashunt-conductor forming a short path for the current around theauxiliary magnet when the auxiliary lever is in engagement with its backstop.

at. The combination with the differential magnet, main lever and sounderof a neutral relay, of an auxiliary magnet for automatically holding themain lever in the position to which it has been attracted by theenergized differential magnet, after the latter has been denergized, anauxiliary lever located in proximity to the differential magnet, acircuit which is closed to energize the auxiliary and sounder magnetswhen the main lever is held in the said position and the auxiliary leveris away from its back stop, and a short circuit around the auxiliarymagnet, closed by the auxiliary lever when the latter is against itsback stop.

5. The combination with the difierential magnet, main lever and sounderof a neutral relay, of an auxiliary magnet, a circuit in which theauxiliary magnet and sounder-magnets are located, the said circuit beingclosed by the main lever when attracted by the differential magnet, theauxiliary magnet acting to hold the main lever in the circuit-closingposition during the making of current reversals as described, anauxiliary lever in proximity to the differential magnet, and a shortcircuit around the auxiliary magnet, closed by the auxiliary lever whenagainst its back stop.

6. The combination with the differential magnet and main lever of aneutral relay, of an auxiliarymagnet located in suitable proximity tothe main lever to attract the latter, a circuit in which the auxiliarymagnet is located, an auxiliary lever located to be acted on by thedifferential magnet when energized, the circuit being closed through theauxiliary magnet when the main lever engages its front stop and theauxiliary lever is away from its back stop, and a shunt-conductorforming a short path for the current around the auxiliary magnet whenthe auxiliary lever is in engagement with its back stop.

7. The combination with the differential magnet, and main lever of aneutral relay, of an auxiliary magnet arranged in suitable proximity tothe main lever of the relay, a circuit in which the auxiliary magnet islocated, the said circuit being closed by the movement of the main leverto its front stop when the differential magnet is energized,the mainlever being retained against its front stop by the auxiliary magnet toprevent the making of a false signal during reversals, an auxiliarylever located to be acted on by the differential magnet, and a shortcircuit around the auxiliary magnet, said circuit being closed by theauxiliary lever when engaging its back stop.

8. The combination with the differential magnet and main lever ofaneutral relay, of an auxiliary magnet located in suitable proximity tothe main lever of the relay, a local circuit in which the auxiliarymagnet is located, said circuit being closed when the main lever is inengagement with its front stop to which position it is attracted by thedifferential magnet when energized, and in which position it is retainedby the auxiliary magnet after the differential magnet has beendeenergized, an auxiliary lever located to be acted on by thedifferential magnet when energized,and ashort path for the current ofthe local circuit around the auxiliary magnet when the auxiliarylever isin engagement with its back stop.

9. The combination with the differential magnet and main lever of aneutral relay, of an auxiliary magnet, a circuit in which the auxiliarymagnet is located, the said circuit being closed by the main lever whenattracted by the differential magnet, the auxiliary magnet acting tohold the main lever in the circuitclosing position during the making ofcurrent reversals as described, an auxiliary lever in proximity to thedifferential magnet, and a short circuit around the auxiliary magnet,closed by the auxiliarylever when against its back stop.

In testimony whereof we affix our signatures in presence of twowitnesses.

CHARLES D. OLSEN. JOHN M. KINNEAR. Vitnesses:

DENA NELSON, A. J. OBRIEN.

